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How to add dashed stroke to a Triangle using FabricJS?
In this tutorial, we are going to learn how to add a dashed stroke to a Triangle using FabricJS. Triangle is one of the various shapes provided by FabricJS. In order to create a Triangle, we will have to create an instance of fabric.Triangle class and add it to the canvas. The strokeDashArray property allows us to specify a dash pattern for the object's stroke.
Syntax
new fabric.Triangle( { strokeDashArray: Array }: Object) Parameters
options (optional) This parameter is an Object which provides additional customizations to our triangle. Using this parameter, properties such as colour, cursor, stroke width, and a lot of other properties can be changed related to the object of which strokeDashArray is a property.
Options Keys
strokeDashArray This property accepts an Array which allows us to specify a dash pattern for the object's stroke. For example, if we pass an array with values [2,3], it means a dash pattern of 2px dash and 3px gap and repeating this pattern infinitely.
Example 1
Default appearance of an object's stroke
Let's see a code example that depicts the default appearance of the stroke of a triangle object. Since we have not used the strokeDashArray property, there is no dash pattern being displayed.
<!DOCTYPE html> <html> <head> <!-- Adding the Fabric JS Library--> <script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/510/fabric.min.js"></script> </head> <body> <h2>Default appearance of an object's stroke</h2> <p>You can see there is no dash pattern in the stroke</p> <canvas id="canvas"></canvas> <script> // Initiate a canvas instance var canvas = new fabric.Canvas("canvas"); canvas.setWidth(document.body.scrollWidth); canvas.setHeight(250); // Initiate a triangle object var triangle = new fabric.Triangle({ left: 150, top: 30, width: 90, height: 80, fill: "#b0e0e6", stroke: "#5f9ea0", strokeWidth: 7, }); // Add it to the canvas canvas.add(triangle); </script> </body> </html> Example 2
Passing strokeDashArray property as key
In this example, we are passing the strokeDashArray property a value of [9,2]. This means that a dash pattern will be created such that there is a 9px long line, followed by a 2px gap, then again a 9px long line will be drawn and so on.
<!DOCTYPE html> <html> <head> <!-- Adding the Fabric JS Library--> <script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/510/fabric.min.js"></script> </head> <body> <h2>Passing strokeDashArray property as key</h2> <p>You can see there is a dash pattern in the stroke now</p> <canvas id="canvas"></canvas> <script> // Initiate a canvas instance var canvas = new fabric.Canvas("canvas"); canvas.setWidth(document.body.scrollWidth); canvas.setHeight(250); // Initiate a triangle object var triangle = new fabric.Triangle({ left: 150, top: 30, width: 90, height: 80, fill: "#b0e0e6", stroke: "#5f9ea0", strokeWidth: 7, strokeDashArray: [9, 2], }); // Add it to the canvas canvas.add(triangle); </script> </body> </html>
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